From: Akira Kyle <ak@akirakyle.com>
To: emacs-devel@gnu.org
Subject: "Asynchronous Requests from Emacs Dynamic Modules"
Date: Fri, 30 Oct 2020 15:35:12 -0600 [thread overview]
Message-ID: <86imarfldb.fsf@akirakyle.com> (raw)
I'm trying to use Emacs' Dynamic Modules in an asynchronous
setting where C module functions run in a separate thread from
Emacs' main thread which is responsible for calling into the
module functions. The natural problem then is how to notify Emacs
when one wants to retrieve the result of the asynchronous
operation from some lisp. Since the module docs explicitly say
that module functions "may only interact with Emacs from Lisp
interpreter threads (including the main thread) created by Emacs",
it is not possible then for a separate module thread to interact
with Emacs in an unprompted way through the module interface [1].
This blog post [2] has a solution to this problem by sending
SIGUSR1 to Emacs, but that feels a bit hackish and forces one to
do more work to manage all the different possible module threads
and events that one may want to signal to Emacs. I suppose one
could also conceivably also use Emacs' dbus support but that still
feels clunky. Maybe its possible it's possible to use Emacs lisp's
threads [2] to solve this but it's not clear to me how to go about
doing so and I haven't found anyone that has done so.
Does anyone know of the best way to handle this? Perhaps the
module interface should be expanded to handle this situation?
[1]
https://www.gnu.org/software/emacs/manual/html_node/elisp/Module-Functions.html#Module-Functions
[2]
https://www.gnu.org/software/emacs/manual/html_node/elisp/Threads.html#Threads
[3] https://nullprogram.com/blog/2017/02/14/
next reply other threads:[~2020-10-30 21:35 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-30 21:35 Akira Kyle [this message]
2020-10-30 22:39 ` "Asynchronous Requests from Emacs Dynamic Modules" Stefan Monnier
2020-10-31 3:18 ` Zhu Zihao
2020-10-31 7:45 ` Eli Zaretskii
2020-10-31 8:02 ` yyoncho
2020-10-31 9:13 ` Eli Zaretskii
2020-10-31 9:45 ` yyoncho
2020-10-31 10:43 ` Eli Zaretskii
2020-10-31 19:25 ` Akira Kyle
2020-10-31 20:18 ` Eli Zaretskii
2020-11-01 0:14 ` Akira Kyle
2020-11-01 18:28 ` Eli Zaretskii
2020-11-01 20:15 ` Akira Kyle
2020-11-01 20:51 ` async-await (was: Re: "Asynchronous Requests from Emacs Dynamic Modules") Philipp Stephani
2020-11-02 15:22 ` "Asynchronous Requests from Emacs Dynamic Modules" Eli Zaretskii
2020-10-31 7:36 ` Philipp Stephani
2020-10-31 12:49 ` Stefan Monnier
2020-11-01 20:18 ` Akira Kyle
2020-11-01 20:32 ` Philipp Stephani
2020-11-20 15:54 ` Zhu Zihao
2020-11-20 16:04 ` Robert Pluim
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